Fuel saving from 2.5 inch exhaust?

[dipmaker]

Has anybody else put a 2.5 inch mandrel bent exhaust on their 05 0n turbo diesel Hilux and had noticeable fuel economy improvement?
The system I am looking at is a Redback with a high flow cat.
I have spent some time trolling the search items but had no real luck.

BTW I am not interested in chipping it.

Cheers
Steve.

[Steve9R]

haha.. yeah.. good sales pitch that one..

i run a 3" sterling exhaust, and yes it definately free's up the engine and the turbo spools higher and she runs a lot better and tows better..

economy... negligible.. but she sounds awesome !

Steve